Lepidoptera (/ Ë l É p Éª Ë d É p t Ér É / lep-i-DOP-tÉr-É) is an order of insects that includes butterflies and moths (both are called lepidopterans). About 180,000 species of the Lepidoptera are described, in 126 families and 46 superfamilies, 10% of the total described species of living organisms.
Skin Tension Lines and how to get it. 1  Skin Tension Lines (STLs) are series of lines based on the direction of tension as this relaxed skin tension lines run perpendicular to the underlying muscles contraction. For best results and aesthetic outcome, place skin incisions along skin tension lines.
Stress and Back Pain. There is a strong connection between stress and back pain. Stress causes a release of stress hormones. Stress hormones increase the perception of pain. Stress hormones also cause the muscles to tighten up. The muscles may tense up so much they go into painful spasms. Muscle tension reduces blood flow to the tissues (reduced oxygen and nutrients to the tissues).